xref: /freebsd/lib/libc/gen/termios.c (revision dba6dd177bdee890cf445fbe21a5dccefd5de18e)
1 /*-
2  * Copyright (c) 1989, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice, this list of conditions and the following disclaimer.
10  * 2. Redistributions in binary form must reproduce the above copyright
11  *    notice, this list of conditions and the following disclaimer in the
12  *    documentation and/or other materials provided with the distribution.
13  * 3. All advertising materials mentioning features or use of this software
14  *    must display the following acknowledgement:
15  *	This product includes software developed by the University of
16  *	California, Berkeley and its contributors.
17  * 4. Neither the name of the University nor the names of its contributors
18  *    may be used to endorse or promote products derived from this software
19  *    without specific prior written permission.
20  *
21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31  * SUCH DAMAGE.
32  */
33 
34 #if defined(LIBC_SCCS) && !defined(lint)
35 static char sccsid[] = "@(#)termios.c	8.2 (Berkeley) 2/21/94";
36 #endif /* LIBC_SCCS and not lint */
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
39 
40 #include "namespace.h"
41 #include <sys/types.h>
42 #include <sys/fcntl.h>
43 #include <sys/ioctl.h>
44 #include <sys/time.h>
45 
46 #include <errno.h>
47 #include <termios.h>
48 #include <unistd.h>
49 #include "un-namespace.h"
50 
51 int
52 tcgetattr(fd, t)
53 	int fd;
54 	struct termios *t;
55 {
56 
57 	return (_ioctl(fd, TIOCGETA, t));
58 }
59 
60 int
61 tcsetattr(fd, opt, t)
62 	int fd, opt;
63 	const struct termios *t;
64 {
65 	struct termios localterm;
66 
67 	if (opt & TCSASOFT) {
68 		localterm = *t;
69 		localterm.c_cflag |= CIGNORE;
70 		t = &localterm;
71 	}
72 	switch (opt & ~TCSASOFT) {
73 	case TCSANOW:
74 		return (_ioctl(fd, TIOCSETA, t));
75 	case TCSADRAIN:
76 		return (_ioctl(fd, TIOCSETAW, t));
77 	case TCSAFLUSH:
78 		return (_ioctl(fd, TIOCSETAF, t));
79 	default:
80 		errno = EINVAL;
81 		return (-1);
82 	}
83 }
84 
85 int
86 tcsetpgrp(int fd, pid_t pgrp)
87 {
88 	int s;
89 
90 	s = pgrp;
91 	return (_ioctl(fd, TIOCSPGRP, &s));
92 }
93 
94 pid_t
95 tcgetpgrp(fd)
96 	int fd;
97 {
98 	int s;
99 
100 	if (_ioctl(fd, TIOCGPGRP, &s) < 0)
101 		return ((pid_t)-1);
102 
103 	return ((pid_t)s);
104 }
105 
106 speed_t
107 cfgetospeed(t)
108 	const struct termios *t;
109 {
110 
111 	return (t->c_ospeed);
112 }
113 
114 speed_t
115 cfgetispeed(t)
116 	const struct termios *t;
117 {
118 
119 	return (t->c_ispeed);
120 }
121 
122 int
123 cfsetospeed(t, speed)
124 	struct termios *t;
125 	speed_t speed;
126 {
127 
128 	t->c_ospeed = speed;
129 	return (0);
130 }
131 
132 int
133 cfsetispeed(t, speed)
134 	struct termios *t;
135 	speed_t speed;
136 {
137 
138 	t->c_ispeed = speed;
139 	return (0);
140 }
141 
142 int
143 cfsetspeed(t, speed)
144 	struct termios *t;
145 	speed_t speed;
146 {
147 
148 	t->c_ispeed = t->c_ospeed = speed;
149 	return (0);
150 }
151 
152 /*
153  * Make a pre-existing termios structure into "raw" mode: character-at-a-time
154  * mode with no characters interpreted, 8-bit data path.
155  */
156 void
157 cfmakeraw(t)
158 	struct termios *t;
159 {
160 
161 	t->c_iflag &= ~(IMAXBEL|IXOFF|INPCK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL|IXON|IGNPAR);
162 	t->c_iflag |= IGNBRK;
163 	t->c_oflag &= ~OPOST;
164 	t->c_lflag &= ~(ECHO|ECHOE|ECHOK|ECHONL|ICANON|ISIG|IEXTEN|NOFLSH|TOSTOP|PENDIN);
165 	t->c_cflag &= ~(CSIZE|PARENB);
166 	t->c_cflag |= CS8|CREAD;
167 	t->c_cc[VMIN] = 1;
168 	t->c_cc[VTIME] = 0;
169 }
170 
171 int
172 tcsendbreak(fd, len)
173 	int fd, len;
174 {
175 	struct timeval sleepytime;
176 
177 	sleepytime.tv_sec = 0;
178 	sleepytime.tv_usec = 400000;
179 	if (_ioctl(fd, TIOCSBRK, 0) == -1)
180 		return (-1);
181 	(void)_select(0, 0, 0, 0, &sleepytime);
182 	if (_ioctl(fd, TIOCCBRK, 0) == -1)
183 		return (-1);
184 	return (0);
185 }
186 
187 int
188 __tcdrain(fd)
189 	int fd;
190 {
191 	return (_ioctl(fd, TIOCDRAIN, 0));
192 }
193 
194 __weak_reference(__tcdrain, tcdrain);
195 __weak_reference(__tcdrain, _tcdrain);
196 
197 int
198 tcflush(fd, which)
199 	int fd, which;
200 {
201 	int com;
202 
203 	switch (which) {
204 	case TCIFLUSH:
205 		com = FREAD;
206 		break;
207 	case TCOFLUSH:
208 		com = FWRITE;
209 		break;
210 	case TCIOFLUSH:
211 		com = FREAD | FWRITE;
212 		break;
213 	default:
214 		errno = EINVAL;
215 		return (-1);
216 	}
217 	return (_ioctl(fd, TIOCFLUSH, &com));
218 }
219 
220 int
221 tcflow(fd, action)
222 	int fd, action;
223 {
224 	struct termios term;
225 	u_char c;
226 
227 	switch (action) {
228 	case TCOOFF:
229 		return (_ioctl(fd, TIOCSTOP, 0));
230 	case TCOON:
231 		return (_ioctl(fd, TIOCSTART, 0));
232 	case TCION:
233 	case TCIOFF:
234 		if (tcgetattr(fd, &term) == -1)
235 			return (-1);
236 		c = term.c_cc[action == TCIOFF ? VSTOP : VSTART];
237 		if (c != _POSIX_VDISABLE && _write(fd, &c, sizeof(c)) == -1)
238 			return (-1);
239 		return (0);
240 	default:
241 		errno = EINVAL;
242 		return (-1);
243 	}
244 	/* NOTREACHED */
245 }
246